How did you create a universal interface for different components or modules of the system?

To create a universal interface for different components or modules of a system in C#, I use interfaces. An interface defines a set of methods and properties that all classes supporting this interface must implement. This allows working with different implementations through a common type, ensuring flexibility and extensibility.

Example:

public interface ILogger
{
    void Log(string message);
}

public class FileLogger : ILogger
{
    public void Log(string message)
    {
        // Write message to a file
    }
}

public class DatabaseLogger : ILogger
{
    public void Log(string message)
    {
        // Write message to a database
    }
}

// Usage
void Process(ILogger logger)
{
    logger.Log("Start of process");
}

This approach makes it easy to add new implementations without changing the code that uses the interface.